Correct Option: C

Assume market price (MP) = Rs. 100
After 20% discount price = 100 - 20% = Rs. 80
After cash discount of 10% price = 80 - 10% = Rs. 72
Price after 10% spend on interior decoration = 72 + 10% = Rs. 79.2

So the cost price (CP) = Rs. 79.2
Selling price after 25 % profit = CP + 25%
= 79.2 + 25% of 79.2
= 1.25 x 79.2
= 99

When initial market price is 100 rupees the selling price is 99.
So for initial market price 8 Lakh the selling price = 8000000 x ( 99 / 100 )
= 7,92,000